This might have been addressed already, but I double-checked the most recent (2021) update to the Campaign Operations rulebook. It still refers to a supposed invasion of Navarre in 3103, supposedly as part of said Clan's attempt to escape the so-called "Adder Collective". However, there is no mention of such an event in Operational Turning Points: Hanseatic Crusade.
So, the question is... did such an invasion actually happen?
If not, might it have been a training exercise on the part of the Imperio, based on the most recent Homeworld-related data they might have had on hand at that point in time?
But if so, might it have gone badly enough for the Coyotes as to not be worth mentioning on the part of the Scorpions, thus perhaps obliging the Coyotes to pass the Imperio by and head on to pastures new?